Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
  • F16L55/04—Devices damping pulsations or vibrations in fluids
  • F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
  • F16L55/05—Buffers therefor

Definitions

• the invention relates to a pulsation damper for an oscillating positive displacement pump, having an inlet connection, an outlet connection and a line connecting them, which is connected to a damping chamber within the pulsation damper.
• Pulsation dampers have the task of reducing pressure fluctuations that are generated by an oscillating displacement pump.
• Oscillating pumps have the characteristic risk that they only convey liquid or gas as the pumping medium during 180 ° of a revolution and thus cause pulsations. In the case of slow-running pumps, this leads to a correspondingly irregular flow, while pressure fluctuations occur in the case of high-speed pumps. This is undesirable in many applications.
• Pulsation dampers in different embodiments are already known.
• a damper is known from DE 1 963709, with which pressure surges in line networks are to be prevented or reduced.
• this device has a damping chamber in which an elastically flexible component is inserted. This can be used to dampen pressure surges that occur in line networks and occur when closing the outlet fittings connected to them. In conjunction with oscillating displacement pumps, such dampers do not provide sufficient smoothing of the flow of the flow of the flow or the pressure pulsation that occurs.
• the object of the present invention is to provide a pulsation damper which, in particular in connection with an oscillating displacement pump, enables high damping of the pressure fluctuations that occur. If necessary, a simple adaptation to pumps with different flow rates is required and / or to different system pressures. After all, the pulsation damper should be simple and compact in construction.
• damping elements made of resilient material are arranged within the damping chambers.
• the throttling elements in connection with the damping chambers form damping members which can temporarily store and release the conveying medium when pressure fluctuations occur.
• a back pressure is built up by the throttle elements during a pressure surge, by means of which a pressure charging of the damping members and a throttled delivery of conveying medium is possible in the pressure drop phase following the pressure phase.
• the inlet and outlet Throttle bodies are expediently designed as interchangeable inserts. They can be screwed in or pressed in as sockets.
• Nozzles, orifices, stepped nozzles, capillaries and adjustable nozzles, for example needle valves, can be used.
• the damping chambers are divided by means of a separating membrane into a receiving space for damping elements and into a region guiding the conveying medium.
• the damping elements cannot come into contact with the conveying medium, so that the damping elements used can only be matched to the required damping properties and resistance to the respective conveying medium is not necessary. This means that even aggressive fluids can be used without any problems if the separating membrane is selected accordingly.
• the damping material used for the damping element within the receiving space of the damping chamber preferably has an approximately linear spring characteristic.
• the spring-elastic damping elements thus have the properties similar to a spring in a desired manner. Particularly good damping is achieved through these resilient properties.
• a damping material can be used that can also be compressed in a closed space, which is not possible, for example, with rubber as a displacement material.
• the unloaded separation membrane delimiting the liquid-carrying region of the damping chamber (s) is at a distance from the damping material.
• the damper for a low system pressure only the soft separating membrane as a spring element. This enables even small pressure peaks to be damped well.
• the separating membrane is partially or fully supported on the damping material. It is thus protected against overstretching and damage and in this operating state there is also damping by the damping material.
• the damping elements have a filling volume that is greater than the volume of the receiving space for the damping elements delimited by the separation membrane in the unloaded state and that the separation membrane is prestressed by the damping element.
• the damping material When the damper is used for a high system pressure, the separating diaphragm is prestressed by the damping material in the opposite direction to the deflection under pressure. This means that a relatively soft damping material can also be used for a large system pressure and the damping is optimized over a large pressure range.
• the damping elements of the second damping chamber are expediently more flexible than those of the first damping chamber.
• the first stage which is designed to be harder, the large pressure peaks are compensated for, and in the second, softer damper stage, the remaining pressure fluctuations that still exist.
• the pulsation damper has a two-part housing with a housing head and a lower housing part, the separating membrane being arranged as a sealing element in the separating plane.
• the separating membrane not only forms the department of the damping chambers in the area guiding the receiving space and the conveying medium, but also seals the individual chambers and channels from one another and from the outside. It is advantageous if in the housing head essentially the inlet and outlet ports, the line channels, inlet and outlet throttling members and conveying medium-carrying areas of the damping chambers and in the lower housing part the receiving spaces for the damping elements are provided. This means that all functional areas of the pulsation damper are easily accessible after separating the housing head and housing base.
• Fig. 2 is a plan view of the pulsation damper shown in Fig. 1 and
• Fig. 3 is a cross-sectional view of a pulsation damper in a modified embodiment compared to FIG. 1.
• a pulsation damper 1 shown in FIG. 1 serves to dampen pressure fluctuations that are generated by an oscillating displacement pump.
• the pressure port of such a positive displacement pump can be connected to the inlet port 2 of the pulsation damper 1 to dampen the pressure fluctuations in order to reduce these pressure fluctuations.
• the pumped medium supplied at the inlet connection 2 emerges smoothly with regard to the pressure fluctuations at an outlet connection 3 of the pulsation damper 1.
• the pulsation damper 1 has a housing 4 in which two damping chambers 5, 6 are provided.
• a line section 7 closes with a branch 8 in the first damping chamber 5.
• the line section 7 is also connected to the second damping chamber 6 via an inlet throttle element 9. From this damping chamber 6, the delivery flow then passes through an outlet throttle element 10 to the outlet connection 3.
• Damping elements 11 made of resilient material are used within the damping chambers 5 and 6.
• the damping elements 11 are located in a receiving space 13 or 14 separated by a separating membrane 12 within the respective damping chamber 5 or 6.
• the remaining part of the damping chambers 5, 6 above the separating membrane 12 is the area 15, 16 which conveys the medium to be conveyed.
• a small volume of the areas 15, 16 carrying the conveying medium is provided for liquids, while a larger volume, as shown in FIG. 3, is provided for gaseous conveying media.
• the volume of the receiving spaces 13, 14 with the damping material located therein corresponds to a multiple, preferably approximately ten times the delivery rate of a pump stroke.
• the damping elements 11 completely fill the receiving spaces 13 and 14, respectively. Nevertheless, there is a resilient resilience, which would not be possible with a rubber-like material.
• the filling volume of the receiving spaces 13 and 14 with damping material is provided in the exemplary embodiment so that the receiving spaces are just filled when the separating membrane 12 is relaxed. But there is also the possibility that a smaller one Filling volume is provided so that the respective discourserai ⁇ m
• damping material is used that the separating membrane 12 to the conveying medium leading areas 15 and 16 is somewhat deflected and thus biased. This makes it possible to use comparatively soft damping material and still achieve good damping even at high system pressures. In particular, optimal damping can be achieved over a large pressure range.
• the preloading of the damping material also allows a compact design of the damper and the use of the same housing parts for low pressure - as well as for high pressure use.
• Damping elements 11 with different spring characteristics can also be used in the two receiving spaces 13 and 14, it being expedient to use a somewhat harder material in the receiving space 13 of the first damping chamber 5 than in the receiving space 14 of the second damping chamber 6 large pressure peaks can be compensated with the damping chamber 5, while the remaining pressure fluctuations still present are largely compensated for in the second damping element with the damping chamber 6.
• the damping elements Like the pressure force on the pump side, which represents a surface load, the damping elements also build up the counterforce as a surface load. Due to the construction and mode of operation as a surface load, there is the property that the separating membrane 12 acts softly under local loads and hard under surface loads. This type of damper can therefore also be used at high system pressures.
• the pulsation damper 1 has a two-stage structure, the two damping units being connected in series.
• the pressure amplitude can be reduced by a certain factor for each stage.
• the residual pulsation of the first stage is reduced again in the second stage. Due to the serial arrangement, damping is possible, which increases with the number of stages.
• the inlet throttle device 9 has the task of generating a dynamic pressure towards the pump. During a pressure surge from the pump, the first damper with the damping chamber 5 is charged by this dynamic pressure and also the second damper with the damping chamber 6 via the inlet throttle element 9 For periods of time with low admission pressure, the medium contained in the damper is throttled and returned to the system via outlet port 3.
• the desired damping or the permissible residual pulsation after the pulsation damper 1 is achieved by a suitable selection of the passage cross sections of the inlet throttling element 9 and the outlet throttling element 10.
• the permissible dynamic pressure or pressure loss of the pulsation damper 1 can also be set with the passage cross section of the throttle bodies. If the throttle bodies are designed as interchangeable inserts, the pulsation damper 1 can be adapted to a large number of pump types and different flow rates with unchanged size. In the exemplary embodiment shown, the throttle elements 9, 10 are not designed to be replaceable as bores.
• the housing 4 is formed in two parts with a housing head 17 and a lower housing part 18, the separating membrane 12 being arranged continuously as a sealing element in the separating plane. It thus covers both damping chambers 5 and 6 and extends to the outer edge of the housing 4, so that the individual chambers are sealed against one another and to the outside. As shown in FIG. 2, the housing 4 can be round. The two damping chambers 5 and 6 each extend over approximately half of the circular cross section. The housing head 17 and the lower housing part 18 are held together by 4 screws in the exemplary embodiment.
• Inlet and outlet ports 2 and 3 are arranged diametrically opposite one another in the housing head, line section 7 connecting to inlet port 2 and line section 7a to outlet port 3. The latter is connected to the second damping chamber 6 via the outlet throttle element 10. Of the Line section 7 goes the branch ' 8 to the first damping chamber 5 and the inlet throttle element 9 leads from the line section 7 into the second damping chamber 6.
• FIG. 3 shows a modified embodiment of a pulsation damper 1a, in which the first damping chamber 5a is arranged concentrically around the second centrally arranged damping chamber 6a and thus forms an annular chamber.
• the structure of this pulsation damper 1 a corresponds to that shown in FIG. 1.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Pipe Accessories (AREA)
• Reciprocating Pumps (AREA)
• Details Of Reciprocating Pumps (AREA)
• Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
• Valve Device For Special Equipments (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7666363

Family Applications (1)

Country Status (6)

Cited By (2)

Families Citing this family (13)

Citations (3)

Family Cites Families (7)

• 2000
  • 2000-12-08 DE DE10061188A patent/DE10061188A1/de not_active Withdrawn
• 2001
  • 2001-11-15 EP EP01994667A patent/EP1340016B1/de not_active Expired - Lifetime
  • 2001-11-15 WO PCT/EP2001/013224 patent/WO2002046657A1/de active IP Right Grant
  • 2001-11-15 JP JP2002548353A patent/JP3751592B2/ja not_active Expired - Lifetime
  • 2001-11-15 DE DE50103678T patent/DE50103678D1/de not_active Expired - Lifetime
  • 2001-11-15 US US10/450,017 patent/US7029250B2/en not_active Expired - Lifetime
  • 2001-11-15 AT AT01994667T patent/ATE276479T1/de not_active IP Right Cessation

Patent Citations (3)

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